mirror of https://github.com/docker/cli.git
75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
// +build !windows
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package pty
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import (
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"os"
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"os/exec"
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"syscall"
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)
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// Start assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
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// and c.Stderr, calls c.Start, and returns the File of the tty's
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// corresponding pty.
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//
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// Starts the process in a new session and sets the controlling terminal.
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func Start(c *exec.Cmd) (pty *os.File, err error) {
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return StartWithSize(c, nil)
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}
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// StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
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// and c.Stderr, calls c.Start, and returns the File of the tty's
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// corresponding pty.
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//
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// This will resize the pty to the specified size before starting the command.
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// Starts the process in a new session and sets the controlling terminal.
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func StartWithSize(c *exec.Cmd, sz *Winsize) (pty *os.File, err error) {
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if c.SysProcAttr == nil {
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c.SysProcAttr = &syscall.SysProcAttr{}
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}
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c.SysProcAttr.Setsid = true
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c.SysProcAttr.Setctty = true
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return StartWithAttrs(c, sz, c.SysProcAttr)
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}
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// StartWithAttrs assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
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// and c.Stderr, calls c.Start, and returns the File of the tty's
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// corresponding pty.
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//
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// This will resize the pty to the specified size before starting the command if a size is provided.
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// The `attrs` parameter overrides the one set in c.SysProcAttr.
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//
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// This should generally not be needed. Used in some edge cases where it is needed to create a pty
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// without a controlling terminal.
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func StartWithAttrs(c *exec.Cmd, sz *Winsize, attrs *syscall.SysProcAttr) (pty *os.File, err error) {
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pty, tty, err := Open()
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if err != nil {
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return nil, err
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}
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defer tty.Close()
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if sz != nil {
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if err := Setsize(pty, sz); err != nil {
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pty.Close()
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return nil, err
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}
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}
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if c.Stdout == nil {
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c.Stdout = tty
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}
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if c.Stderr == nil {
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c.Stderr = tty
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}
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if c.Stdin == nil {
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c.Stdin = tty
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}
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c.SysProcAttr = attrs
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if err := c.Start(); err != nil {
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_ = pty.Close()
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return nil, err
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}
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return pty, err
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}
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